[Bug 1904419] Re: Upgrade glibc 2.32 by required upstream patches

[Frank Heimes]

Ok, so the following two topics remain:

1)
"Fixing unneeded extra conversion of IPC_INFO and SHM_INFO for __IPC_TIME64, since their information does not contain any time related fields."
Fixed with:

commit "sysvipc: Fix IPC_INFO and SHM_INFO handling [BZ #26636]"
(https://sourceware.org/git/?p=glibc.git;a=commit;h=0b9460d22e285432d232f42c7442a3226e1bf830)
"Bug 26636 - 32-bit shmctl(IPC_INFO) crashes when shminfo struct is at the end of a memory mapping "
(https://sourceware.org/bugzilla/show_bug.cgi?id=26636)
and
commit "sysvipc: Fix IPC_INFO and MSG_INFO handling [BZ #26639]"
(https://sourceware.org/git/?p=glibc.git;a=commit;h=c4aeedea598a1bd80f52ca9ebd07fe447680d491)
"Bug 26639 - msgctl IPC_INFO and MSG_INFO return garbage "
(https://sourceware.org/bugzilla/show_bug.cgi?id=26639)

2)
With SEM_STAT_ANY the buffer argument is not properly passed over (in contrast to just SEM_STAT).
Fixed with:

commit "sysvipc: Fix SEM_STAT_ANY kernel argument pass [BZ #26637]"
(https://sourceware.org/git/?p=glibc.git;a=commit;h=9b139b6b81a5def91bec01f30301acc95fbf0289)
"Bug 26637 - semctl SEM_STAT_ANY fails to pass the buffer specified by the caller to the kernel "
(https://sourceware.org/bugzilla/show_bug.cgi?id=26637)

(skipping resolv)

Since the integration of such patches in Ubuntu require that an SRU justification is provided;
https://wiki.ubuntu.com/StableReleaseUpdates#SRU_Bug_Template
I'm wondering what the real impact is? And if there is a known reproducer available?

For 1) is it just performance improvements due to the unneeded
conversion or did something broke (particularly on s390x) ?

For 2) again is it just an improved performance due to the fact that the
buffer was not properly passed over or did the erroneous passing over of
the buffer led to errors and broke something?

How were these issues identified - due to code analysis or by users that
raised bugs?

>From the commits I noticed that there are regression test cases mentioned.
But I'm not sure if that's sufficient for the needed SRU TestCase section (https://wiki.ubuntu.com/StableReleaseUpdates#SRU_Bug_Template).

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https://bugs.launchpad.net/bugs/1904419

Title:
  Upgrade glibc 2.32 by required upstream patches

Status in Ubuntu on IBM z Systems:
  Triaged
Status in glibc package in Ubuntu:
  Fix Released
Status in glibc source package in Groovy:
  New
Status in glibc source package in Hirsute:
  Fix Released

Bug description:
  The current libc6-2.32-0ubuntu3 package lacks some of the upstream
  glibc commits on the "release/2.32/master" branch (see
  http://sourceware.org/git/?p=glibc.git;a=shortlog;h=refs/heads/release/2.32/master).
  Does Ubuntu automatically pick the commits from this release branch?

  Otherwise, please update to the latest commits on this branch, especially for:
  - 2dfa659a66 resolv: Handle transaction ID collisions in parallel queries (bug 26600)
  - 0b9460d22e sysvipc: Fix IPC_INFO and SHM_INFO handling [BZ #26636]
  - c4aeedea59 sysvipc: Fix IPC_INFO and MSG_INFO handling [BZ #26639]
  - 9b139b6b81 sysvipc: Fix SEM_STAT_ANY kernel argument pass [BZ #26637]
  - ...

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